Burning Too Much Fuel

Jim the power valves do almost nothing to meter the gas, only what minimum vacuum the valve permits gas through the PVCR's, and with a vac gauge you can estimate when they are likely opening.

The main jets and PVCR's drilled into the metering block meter the gas on the primary side, and a metering plate on the secondary side meters tha gas on 4160s, else its similar on both sides for 4150's.

Perhaps try this...Buy a couple new plugs...

Install a new plug and do a WOT run and then shut down immediately and photograph the insulator of the plug. Cut away the threads of the plug with a hacksaw.

Then disconnect the secondaries, install a new plug and do the same WOT run and examination. Post the insulator photos and then we'll have something tangible to discuss.

Then reply with your timing numbers at idle, 1500, 2500, 3000 rpm and final(max)


Also, perhaps tubing at 15-25 mph is probably not a very efficient speed for that hull.

With little boats like Mustangs, it really depends on how many people are in it, because I can tell a difference when there is just a driver and a skier, but two or three extras in the boat and she'll burn alot more gas. But per hour I would say 3 maybe 4 gallons a hour, which is mostly wakeboarding/wakeskating at 19 to 20 miles per hour with only a driver in the boat. I will say the holley I use now does use more gas than the original carb.

I just had a thought. Could the problem be that original prop off my '66 Mustang which I have been running all year on my '68? From readings in other posts I well know that new props out perform older props - are they also substantially more efficient?

A new prop has been in the que for me to buy all year but so far I keep finding more important things to do with $350.00. (Such as buying gasoline.)

I have a problem, when I start my engine and look down the gas filler tube it looks like a toilet flushing.

I wonder what gas is at the dock this weekend $$. It's about $3.05 for regular at the gas stations here in California.

captan, you are right - we don't need a fuel pump on our engine, we just need a flush handle on our gas tank.

I burn 6 gallons in about 20 mins if I'm wide open or above 4000 rpm. If i just put around it's not too bad